Process of making razor blades



f Oct. 4, 1932. J. TREIBER 1,881,334 PROCESS OF MAKING RAZOR BLADES .Filed Aug. 23, 1929 2 Sheets-Sheet l l ii.

IN VEN TOR.

Oct. 4, 1932. J. TRVEIBER 1,881,334

PROCESS OF MAKING RAZOR BLADES Filed Aug. 23, 1929 V 2 Sheets-Sheet 4 H9. 5 Fig.6.

A TTORNEYS.

Patented Oct. 4, 1932 JULIUS TREIBER, or

l-sotm mm wx 1 PROCESS or MAKLIliG, itKZcItlBLADES Application filed August as, 1929, Serial (est-tsetse in eer anyipecem er 15, 1925.

My invention has for its object a new razor blade and a process for manufacturing it. All the known razor blades generally have a thickness of 0.15 mm. This thickness has 5 been proved to be the most favorable, as on y hardened. This thickness of the blade, hoW-- ever, requirestwo independent grinding op- This Object the one hand a blade of this thickness possessand, on the other;

es a sufficient elasticity hand, does not get warped when hardened, and, finally, it can easily be rolled and erations, because one single grinding opera tion requires too much time when a finegrained grinding disk is used, while no sufii 15 ciently clean and fit cutting facet is obtained satisfactorily clean and fit cutting edges can when a coarse-graineddisk is used.

Now the object of my invention is a razor blade that possesses all the above advantages but requires one improved blade in the range of the cutting edge is thinner than on its middle portion, and the cutting facet can now be produced in a satisfactorily short time by means of a fine ly grained grinding disk or disks. Grind ing by the use of a coarsely grained pre-" liminary grinding disk and a finely grained finishing disk is no longer necessary.

According to my process the blade is etched along their cutting edges on a determined;

width to such an extent that its thickness is reduced by about one third. In the range of its cutting edges the blade has then a thick-" ness of about 0.1 mm.

easily understood, an appliance serving to carry out my manufacturing process is i1- lustrated in the accompanying drawings in the top of the pile and the blanks l and plates which 40 Figure 1 is a perspective view of the ap sole grinding operation only! is obtained by the fact that my In order that my invention can be more- Figure 5 is a plan View ofxthe blank from which the razor blade is: made,

Figure 6 is a sectional view thereof, Figurefi i's a plan view of the bladeafter itisetchedyw @1 1 Figure 8 153. seotiona-liviewv thereof, Figure 9'is a plan viewofthe blade in its finished state" after it is ground, and I v Figure 10is a sectional view. Referringtowthese Figures, 1 denotes the blade the -.middle portionof ,which has a thickness of0.15 mm..- Along each ofits cuttingedgesthe'blade has a marginalportion 3 the thickness of which: is only about 0.1mm. With this reduced thickness of aboutlOl mm.

- beobtained by onesole grinding operation by means of a diskofgsuflicientlyj'fine grain.

"Forthe manufactureof .the described razor blade I- 'have' further invented a suitable ap- :-pliance-that permits ofv a great number of blades to be etched in unison, an embodiment of this appliance being illustrated in Figures 1 to 3. As to-be seen therefrom, the appliance consists in" abase plate 4: having mounted on it two-or three parallel bars 5scorresponding to' the holes'normally provided in razor blades; The blanks to be treated areslid on these bars in such a manner asto alternate "with interp'os'ed plates 6 which. consist of a im'aterial that is not" attacked. by the etching liquid s'ucli as' celluloid, and. the width of 'vvhich cor responds to the thicker portion of the future blades. The margins to be reduced in thickness'of the blade blanks thus project beyond-the plates 6; After a'pile of blanks 1 and plates (i-h'as "been. thus; formed on the base plate 4 a strong'presser plate 7 is put on "6 are then so firmly "pressed. together by "screwin nuts 8 onto the bars 5 that-no etching liquid can enter between the plates. and f blanks.

The whole frame 4:, 5, 7 with the blanks thereon is thereupon hung into a tankcontaining the etching liquid such as nitric acid, until the margins 3, 3 of the blanks have reached the desired reduced thickness. The frame is then lifted from the tank, washed and cleaned by means of brushes so that the etched margins of the blanks show a mat white color. After being removed from the frame, the blanks are ground in the usual manner, one sole grinding operation by means of one grinding disk for each side of the blade being suflicient to obtain a satisfactory cutting edge, as explained above.

While the drawings of this application show the cutting edge formed by beveling both sides of the blade to form the cutting edge, in some types of blades only one side of the blade is beveled to form the cutting edge. In this latter type of course one grinding disk would be sufficient to obtain a satisfactory cutting edge.

What I claim and desire to secure by Letters Patent is I 1. A process for manufacturing a razor blade, consisting in manufacturing a blank of uniform thickness, reducing its thickness in the marginal range of its future cutting edges by an etching operation, and grinding cutting edges thereon.

2. A process for manufacturing a plurality of razor blades having along their cutting edges margins of smaller thickness than their middle portion consisting in manufacturing a plurality of blanks, forming a compressed pile consisting alternatively of said blanks and of plates of smaller width than these and of a material proof against the action of acids, dipping this pile in acid so as to cause the acid to reduce the exposed portions of the blades, and grinding thev etlched portions of the blades to form cutting e es.

5 The method of making a razor blade which consists in producing a blade blank of substantially uniform thickness, applying to all of the blade blank except marginal portions to be treated, a material to protect the blade except at its marginal portion or portions against the action of acids, then subjecting the unprotected portion of the blade to the action of an etching acid to reduce it to an intended thickness, and then grinding the etched portion of the blade to form a cutting edge.

4. The method of making a razor blade which consists in producing blade blank of substantially uniform thickness, applying to all of the blade blank except marginal portions to be treated, a material to protect the blade against the action of acids, then subjecting the unprotected portion of the blade to the action of an etching acid to reduce it to an intended thickness, washing off the acid, and then grinding the etched portion. of the blade to form a cutting edge.

5. The method of making razor blades,

which consists in producing blade blanks of substantially uniform thickness, disposing a plurality of such blades in a pile and covering all except marginal portions of the blades so as to protect the covered portions of the blades against the action of an acid, then subjecting the uncoveredportions of all the blades to the action of an etching acid to reduce the thickness thereof, and then grinding the edges of the blades to form cutting edges.

In testimony whereof I aflix my signature.

JULIUS TREIBER. 

